JP5399358B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device.

  A liquid crystal display device having a structure in which a resin frame is disposed between a liquid crystal display panel and a metal frame is known (Patent Document 1). The metal frame protects the liquid crystal display panel, and the resin frame serves as a buffer member that prevents direct contact between the liquid crystal display panel and the metal frame.

JP 2009-31753 A

  A reflective sheet is disposed between the metal frame and the resin frame. The lower surface of the reflection sheet is attached to the metal frame with a double-sided tape, and the upper surface is also attached to the resin frame with a double-sided tape. Therefore, since the reflection sheet and the two double-sided tapes are interposed between the resin frame and the metal frame, the apparatus is prevented from being thinned.

  On the other hand, a structure is known in which the double-sided tape between the reflection sheet and the metal frame is eliminated and the resin frame is engaged with the metal frame. However, in that case, an engagement claw is formed on the resin frame, and the outer wall of the metal frame must be formed thick so that the claw can be engaged, which hinders downsizing of the apparatus.

  An object of the present invention is to reduce the thickness of a liquid crystal display device.

  (1) A liquid crystal display device according to the present invention includes a lower frame, a reflective sheet disposed on the lower frame, and an inner frame disposed on the reflective sheet having a frame shape and a space inside. And a light guide plate disposed in the space of the inner frame so as to face the reflection sheet, and a liquid crystal display panel disposed on the inner frame, wherein the inner frame is a first region. And the second region, the surface facing the direction of the lower frame, the reflection sheet has a shape that faces the first region of the inner frame and avoids the second region, The first region of the inner frame and the reflective sheet are adhered or bonded by a first holding member interposed therebetween, and the second region of the inner frame and the lower frame are interposed between both. To the second holding member Adhesive or glued I, the first holding member and the second holding member is characterized by being arranged so as to avoid duplication. According to the present invention, the lower frame and the inner frame are adhered or adhered, and the inner frame and the reflection sheet are adhered or adhered, so that these are held. And since the 1st holding member and the 2nd holding member do not overlap, thickness does not increase and it can attain thickness reduction of a liquid crystal display device.

  (2) In the liquid crystal display device described in (1), at least one of the first holding member and the second holding member may be a double-sided tape having an adhesive on both surfaces of a base material. .

  (3) In the liquid crystal display device described in (1) or (2), the surface of the inner frame facing the direction of the lower frame has a rectangular outer shape, and the second region has the rectangular shape. It may be characterized by including four corners.

  (4) In the liquid crystal display device described in (3), the first region may be in a portion along a pair of sides of the rectangle.

  (5) In the liquid crystal display device according to any one of (1) to (4), the liquid crystal display device further includes a flexible wiring board attached to the second region of the inner frame, The second holding member may have a shape that avoids the second holding member.

  (6) The liquid crystal display device according to any one of (1) to (5) may further include an optical sheet disposed between the light guide plate and the liquid crystal display panel.

It is a top view which shows the liquid crystal display device which concerns on embodiment of this invention. It is the II-II sectional view taken on the line of the liquid crystal display device shown in FIG. It is the top view of the liquid crystal display device which removed the lower frame and was seen from the reflective sheet side. FIG. 4 is a cross-sectional view taken along the line IV-IV of the liquid crystal display device shown in FIG. 3. FIG. 5A is a diagram illustrating Example 1, in which FIG. 5A corresponds to a cross-sectional view taken along line II-II in FIG. 1, and FIG. 5B is a cross-sectional view taken along line bb in FIG. Equivalent to. It is the top view which looked at the inner frame from the side by which a reflective sheet is arrange | positioned. 7A and 7B are diagrams illustrating Example 2, in which FIG. 7A corresponds to a cross-sectional view taken along line II-II in FIG. 1, and FIG. 7B is a cross-sectional view taken along line bb in FIG. Equivalent to. It is the top view which looked at the inner frame used in Example 2 from the side by which a reflective sheet is arrange | positioned. 6 is a top view of a reflection sheet used in Example 1 and Example 2. FIG. 6 is a top view of a lower frame used in Example 1 and Example 2. FIG. 6 is a top view of a lower frame used in Embodiment 3. FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view showing a liquid crystal display device according to an embodiment of the present invention. 2 is a cross-sectional view of the liquid crystal display device shown in FIG. 1 taken along the line II-II.

  The liquid crystal display device includes a liquid crystal display panel 10. The liquid crystal display panel 10 has a pair of substrates 12 and 14 (glass substrates), and a liquid crystal (not shown) is interposed therebetween. One substrate 12 is a TFT (Thin Film Transistor) substrate (or array substrate) including thin film transistors, pixel electrodes, wirings, and the like (not shown), and the other substrate 14 is a color filter substrate. The driving method of the liquid crystal display panel 10 may be any method such as an IPS (In Plane Switching) method, a TN (Twisted Nematic) method, or a VA (Vertical Alignment) method, and electrodes and wirings corresponding to the method are formed. The An integrated circuit chip 16 incorporating a driver circuit for driving the liquid crystal is mounted on one end of the substrate 12, and a first flexible wiring substrate 18 is attached. The liquid crystal display panel 10 includes a polarizing plate 20. The polarizing plate 20 is affixed to a region (region surrounded by each peripheral end portion of the substrates 12 and 14) that avoids the end portions (peripheral end portions) of the substrates 12 and 14.

  The liquid crystal display device includes a light guide plate 22 that is a part of the backlight. The light guide plate 22 converts light of a light emitting diode (not shown) as a point light source into a surface light source and irradiates the liquid crystal display panel 10. An optical sheet group 24 is disposed between the liquid crystal display panel 10 and the light guide plate 22. The optical sheet group 24 includes a diffusion sheet and a prism sheet. A reflection sheet 26 is disposed under the light guide plate 22 (on the side opposite to the optical sheet group 24).

  The liquid crystal display device has a reflection sheet 26. The light guide plate 22 is disposed so as to face the reflection sheet 26. The light emitted from the light guide plate 22 toward the reflection sheet 26 is reflected by the reflection sheet 26 and returns to the light guide plate 22.

  The liquid crystal display device has an inner frame 28 made of, for example, resin. The inner frame 28 has a frame shape and has a space 30 inside. The liquid crystal display panel 10 is disposed on the inner frame 28. The inner frame 28 and the liquid crystal display panel 10 are fixed by an adhesive or adhesive such as a double-sided tape 32 interposed therebetween. The outer peripheral end of the lower surface of the substrate 12 constituting the liquid crystal display panel 10 faces the inner frame 28, and the area inside the outer peripheral end faces the space 30 of the inner frame 28. Of the polarizing plates 20 constituting the liquid crystal display panel 10, the polarizing plate 20 disposed on the backlight side is disposed in the space 30 of the inner frame 28. The light guide plate 22 is disposed in the space 30 of the inner frame 28. Therefore, the upper surface of the light guide plate 22 faces the liquid crystal display panel 10, and the surface-emitting light enters the liquid crystal display panel 10.

  The liquid crystal display device has a lower frame 34 made of, for example, metal. The lower frame 34 includes a peripheral wall portion 36 located outside the outer peripheral surface of the inner frame 28 (surface facing away from the space 30) and a lower surface of the inner frame 28 (surface facing away from the liquid crystal display panel 10). And a bottom wall portion 38 located at the bottom. The reflection sheet 26 is disposed between the inner frame 28 and the lower frame 34 (bottom wall portion 38). That is, the reflection sheet 26 is disposed on the lower frame 34. The inner frame 28 is disposed on the reflection sheet 26.

  FIG. 3 is a plan view of the liquid crystal display device as seen from the reflection sheet 26 side with the lower frame 34 removed. 4 is a cross-sectional view taken along line IV-IV of the liquid crystal display device shown in FIG.

  The inner frame 28 has a surface that faces the direction of the lower frame 34. A surface facing the direction of the lower frame 34 of the inner frame 28 includes a first region 40 shown in FIG. 2 and a second region 42 shown in FIG. 3, and has a rectangular outer shape. The surface facing the direction of the lower frame 34 of the inner frame 28 is a frame shape, and the inner shape is also a rectangle.

  The first region 40 of the inner frame 28 faces the reflection sheet 26. In other words, the area facing the reflection sheet 26 of the inner frame 28 is the first area 40. The first region 40 is at least in a portion along a pair of rectangular sides. The first region 40 of the inner frame 28 and the reflection sheet 26 are adhered or bonded by a first holding member 44 interposed therebetween. The 1st holding member 44 is a double-sided tape which has an adhesive on both surfaces of a base material. The reflective sheet 26 also faces the light guide plate 22 disposed in the space 30 of the inner frame 28.

  The reflection sheet 26 has a shape that avoids facing the second region 42. In other words, the region where the inner frame 28 is prevented from facing the reflection sheet 26 is the second region 42. The second region 42 includes four corners of the rectangular outer shape of the inner frame 28. The inner frame 28 includes an upper second region 42a and a lower second region 42b.

  A rectangular cutout 261 is formed in the reflection sheet 26 at the left and right corners on the upper side in FIG. A portion of the inner frame 28 that faces the notch 261 of the reflection sheet 26 is the upper second region 42a.

  On the other hand, the region between the left and right corners (region along one side of the inner frame 28) of the inner frame 28 on the lower side in FIG. This is a region that avoids facing the sheet 26).

  The second region 42 of the inner frame 28 and the lower frame 34 are adhered or bonded by a second holding member 46 interposed therebetween. In FIG. 3, a rectangular (rectangular) second holding member 46 is disposed in the upper second region 42. In FIG. 3, a triangular second holding member 46 is arranged in the lower second region 42. The first holding member 44 and the second holding member 46 are arranged so as to avoid duplication. The 2nd holding member 46 is a double-sided tape which has an adhesive on both surfaces of a base material.

  The liquid crystal display device has a second flexible wiring board 48. The second flexible wiring board 48 mounts a light source (not shown) (not shown) and is electrically connected to the light source. The second flexible wiring board 48 is affixed to the lower second region 42 b of the inner frame 28. That is, the second flexible wiring board 48 avoids the reflection sheet 26. The second flexible wiring board 48 has a shape that avoids the second holding member 46. Specifically, the second flexible wiring board 48 is cut out at a portion corresponding to a corner portion of the surface of the inner frame 28.

  When an LED (light emitting diode) is used as the light source, the light emitting surface of the LED mounted on the second flexible wiring board 48 faces the side wall surface of the light guide plate 22.

  FIGS. 5A and 5B show Example 1 of the present embodiment, and FIG. 5A corresponds to a cross-sectional view taken along the line II-II in FIG. ) Corresponds to a cross-sectional view taken along line bb in FIG.

  In FIG. 5A, the upper surface of the inner frame 128 is affixed to the lower surface of the substrate 12 constituting the liquid crystal display panel 10 by a double-sided tape 32. On the other hand, the lower surface of the inner frame 128 is affixed to the reflection sheet 26 by the first holding member 44. In this example, an adhesive tape was used as the first holding member 44.

  The inner frame 128 has a thick portion in which the thickness T2 (see FIG. 5B) of the second region 42 is thicker than the thickness T1 of the first region 40 (see FIG. 5A). 281. The upper surface of the thick portion 281 is attached to the lower surface of the substrate 12 constituting the liquid crystal display panel 10 by a double-sided tape 32. On the other hand, the lower surface of the thick portion 281 is attached to the lower frame 34 by the second holding member 46. In this embodiment, an adhesive tape is used as the second holding member 46.

  The thickness T2 of the thick part 281 is made thicker than the thickness T1 of the other part of the inner frame 128 by the same thickness as that of the reflection sheet 26. With this configuration, the distance between the bottom wall portion 38 of the lower frame 34 and the lower surface of the substrate 12 can be made equal over the entire surface. In addition, since the inner frame 128 absorbs the difference in thickness of the reflection sheet 26 (difference in presence or absence), the same holding member can be used for the first holding member 44 and the second holding member 46.

  The side surface of the light guide plate 22 is disposed to face the inner wall surface of the inner frame 128 with the space 30 therebetween. The inner frame 128 is formed of a white resin, reflects light leaking from the side surface of the light guide plate 22, and sends the light leaking from the light guide plate 22 to the light guide plate 22 again.

  FIG. 6 is a top view of the inner frame 128 as viewed from the side where the reflection sheet 26 is disposed. In the second region 42 (the upper second region 421 and the lower second region 422), the second holding member 46 is disposed in the thick portion 281.

  FIGS. 7A and 7B show Example 2 of the present embodiment, and FIG. 7A corresponds to a cross-sectional view taken along the line II-II in FIG. ) Corresponds to a cross-sectional view taken along line bb in FIG. Moreover, the same code | symbol is attached | subjected to the site | part same as embodiment or Example 1, and description is abbreviate | omitted.

  In this embodiment, the inner frame 28 does not have a protrusion and is formed with the same thickness. As the double-sided tape 32 for attaching the inner frame 28 and the substrate 12, the same double-sided tape as in Example 1 was used.

  On the other hand, the first holding member 441 for attaching the inner frame 28 and the reflection sheet 26 has a thickness t3, and the second holding member 461 for attaching the inner wall 28 and the bottom wall portion 38 of the lower frame 34 has a thickness t4. Have.

  The thickness t4 of the second holding member 461 is formed to be thicker than the thickness t3 of the first holding member 441. By increasing the thickness of the second holding member 461, it is possible to absorb the difference in thickness of the reflection sheet 26 (difference in whether or not it exists). At this time, as in the first embodiment, the side surface of the light guide plate 22 is disposed to face the inner wall surface of the inner frame 28 with the space 30 interposed therebetween.

  FIG. 8 is a top view of the inner frame 28 used in the present embodiment as seen from the side where the reflection sheet 26 is disposed. In the drawing, the reflection sheet 26 is disposed in a region surrounded by a dotted line. The second holding member 461 is disposed in the second region 42 (the upper second region 42a and the lower second region 42b), and the first holding member 441 is disposed in the first region 40 where the inner frame 28 and the reflection sheet 26 overlap. Arrange (see FIG. 7A).

  By adopting the configuration as in Example 1 or Example 2, a thin liquid crystal display device including a backlight can be provided.

  FIG. 9 is a top view of the reflection sheet 26 used in the first and second embodiments. The substantially rectangular reflection sheet 26 has notches 261 at the corners. By providing the notch 261, the substrate 12 and the lower frame 34 of the liquid crystal display panel 10 can be bonded via the inner frame 28 and the adhesive tape.

  FIG. 10 is a top view of the lower frame used in the first and second embodiments. The lower frame 34 includes a peripheral wall portion 36 and a bottom wall portion 38. The lower frame 34 has a frame shape surrounding the liquid crystal display panel 10 and the backlight. The cross section of the connecting portion between the peripheral wall portion 36 and the bottom wall portion 38 is L-shaped. Further, the lower frame 34 in FIG. 10 has an opening at the center, but this opening is not always necessary, and the bottom wall 38 may exist on the entire surface.

  FIG. 11 is a top view of the lower frame used in the third embodiment. The lower frame 334 has a protrusion 381 at an adhesive portion with the inner frame 28 (a portion that avoids the reflection sheet 26). This protrusion 381 absorbs the difference in thickness of the reflection sheet 26 (difference in presence or absence).

  In addition, since the thickness of the reflection sheet 26 is about 50 micrometers, it can also absorb using the elasticity of a double-sided tape. In that case, the protrusion and thickness difference shown in each embodiment are not necessary.

  In the present embodiment, the liquid crystal display panel 10, the backlight, and the lower frame 34 can be integrated by reducing the double-sided tape layer and disposing the double-sided tape layer above and below the inner frame 28.

  According to the present embodiment, the lower frame 34 and the inner frame 28 are adhered or adhered, and the inner frame 28 and the reflection sheet 26 are adhered or adhered, so that these are held. And since the 1st holding member 44 and the 2nd holding member 46 do not overlap, thickness does not increase and it can attain thickness reduction of a liquid crystal display device.

  The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the configuration described in the embodiment can be replaced with substantially the same configuration, a configuration that exhibits the same operational effects, or a configuration that can achieve the same purpose.

  DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel, 12 board | substrate, 14 board | substrate, 16 Integrated circuit chip, 18 1st flexible wiring board, 20 Polarizing plate, 22 Light guide plate, 24 Optical sheet group, 26 Reflective sheet, 28 Inner frame, 30 space, 32 Double-sided tape , 34 Lower frame, 36 Perimeter wall portion, 38 Bottom wall portion, 40 First region, 42 Second region, 42a Upper second region, 42b Lower second region, 44 First holding member, 46 Second holding member, 48 Second flexible wiring board, 128 inner frame, 261 notch, 281 thick part, 334 lower frame, 381 protrusion, 421 upper second region, 422 lower second region, 441 first holding member, 461 second holding Element.

Claims (6)

The lower frame,
A reflective sheet disposed on the lower frame;
An inner frame having a frame shape and having a space on the inner side and disposed on the reflective sheet;
A light guide plate disposed in the space of the inner frame so as to face the reflective sheet;
A liquid crystal display panel disposed on the inner frame;
Have
The inner frame has a surface that is composed of a first region and a second region and faces the direction of the lower frame,
The reflective sheet has a shape that faces the first region of the inner frame and avoids facing the second region;
The first region of the inner frame and the reflective sheet are adhered or adhered by a first holding member interposed between the two,
The second region of the inner frame and the lower frame are adhered or bonded by a second holding member interposed therebetween,
The liquid crystal display device, wherein the first holding member and the second holding member are arranged so as to avoid duplication. The liquid crystal display device according to claim 1,
At least one of said 1st holding member and said 2nd holding member is a double-sided tape which has an adhesive on both surfaces of a base material, The liquid crystal display device characterized by the above-mentioned. The liquid crystal display device according to claim 1 or 2,
The surface of the inner frame facing the lower frame has a rectangular outer shape;
The liquid crystal display device, wherein the second region includes four corners of the rectangle. The liquid crystal display device according to claim 3,
The liquid crystal display device, wherein the first region is in a portion along a pair of sides of the rectangle. The liquid crystal display device according to any one of claims 1 to 4,
A flexible wiring board affixed to the second region of the inner frame;
The liquid crystal display device, wherein the flexible wiring board has a shape that avoids the second holding member. The liquid crystal display device according to any one of claims 1 to 5,
The liquid crystal display device further comprising an optical sheet disposed between the light guide plate and the liquid crystal display panel.

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